FINAL REPORT Evaluation of Seawater Desalination Projects ...

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EVALUATION OF SEAWATER DESALINATION PROJECTS PROPOSED FOR THE MONTEREY PENINSULA Costs for chemicals in the estimate appear to be purchase costs, not including expense of transporting and handling them to the ship. Additionally, no contingency or on-line factor appears to have been included in the operating cost estimate. Conclusion The component treatment technologies (membrane filtration and reverse osmosis) selected for the Water Standard Company project are in concept appropriate for the application. However, important design parameters of the membrane filtration and RO must be defined through long-term pilot testing. Of specific concern is the development of chemical washing design parameters (Pall’s EFM process) and Clean-in-Place requirements. Considering that these processes generally use chemicals (e.g., sodium hypochlorite, caustic, and acids) that require special handling and introduce safety requirements, their impact on operating on shipboard could be critical. The proponent’s cost estimates for the treatment components of the project are considered optimistic, with the selection of maintenance budget and contingency level (both capital and operating). Assumptions on electricity expense deserve additional scrutiny should the project receive further consideration Waste Stream Fate Identified Brine from the desalination process would be disposed of by diluting it with native seawater in containers on the vessel. This process is also designed to cool the diluted brine to levels near ambient seawater temperature. The diluted brine is discharged at sea surface. Availability of Historical Feedwater Quality Data and Sanitary Survey No data have been collected. Quality of Supporting Documentation The most comprehensive document provided or obtained in support of the SDV is the proponent’s statement, dated April 2007. The six-page statement provided summary information regarding the following: • Project proposal • Project description and summary • Contract option • Drinking water production and operations • Timeline and schedule • Public outreach and lobbying efforts Monterey Peninsula Water Management District 3-24
EVALUATION OF SEAWATER DESALINATION PROJECTS PROPOSED FOR THE MONTEREY PENINSULA Costing information was provided in another document. The proponent has submitted additional information over the past year in public presentations and in response to requests by this reviewer. The project has evolved substantially over this time, much of the new information contradicts or supersedes information provided in the proponent’s statement, and cost estimates have been sharply increased for some major components. An updated proponent’s statement has not been provided. Supports Local Area and Regional Objectives The SDV supports local area objectives by resolving the water supply issues associated with SWRCB Order No. 95-10 and by providing water to reduce overdraft of the Seaside Groundwater Basin. Although not specified by the project proponents, the project has the potential to meet additional water needs in the region. Omissions or Fatal Flaws Because a project of this type and size has not been constructed before, life cycle costs for construction, operation, maintenance, and replacement cannot be determined with great confidence. See also Table 11, Regulatory Requirements, in Section 7 of this report in regard to the potential need for additional information. Monterey Peninsula Water Management District 3-25
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FINAL REPORT Evaluation of Seawater Desalination Projects ...

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